Water flows through a horizontal 60-mm-diameter galvanized iron pipe at a rate of 0.02m3/s. If the pressure drop is 135 kPa per 10 mof pipe, do you think this pipe

is (a) a new pipe,(b) an old pipe with a somewhat increased roughness due to aging, or (c) a very old pipe that is partially clogged by deposits? Justify your answer.